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(Quick?) update on the PS-to-SPS transfer MDs

(Quick?) update on the PS-to-SPS transfer MDs. Helga Timkó BE-RF-BR in collaboration with Theodoros Argyropoulos , Thomas Bohl , Heiko Damerau , Steven Hancock, Juan Esteban Müller, Elena Shaposhnikova. Measurement conditions.

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(Quick?) update on the PS-to-SPS transfer MDs

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  1. (Quick?) update on thePS-to-SPS transfer MDs Helga Timkó BE-RF-BR in collaborationwith Theodoros Argyropoulos, Thomas Bohl, Heiko Damerau, Steven Hancock, Juan Esteban Müller, Elena Shaposhnikova

  2. Measurement conditions • We have a dedicated cycle now, LHCMDION, for systematic measurements under stable conditions • Single batch, 50 ns spaced LHC-type beam, 36 bunches • Intensity: 1.6-1.7 1011ppb • Varying the PS rotation timings t40 MHz and t80 MHz • SPS voltage as usual • SPS FB is shortened to 1260 ms • SPS acceleration ramp only until at 30 GeV • Bunch length: • at PS ejection • Transmission: • (intensity at 30 GeV) / (injected intensity) SPSU-BD Meeting

  3. 140 MHz, 280 MHz cavities Gain: TOP = 96.2 % TMAX = 97.1 % SPSU-BD Meeting

  4. … in agreement with the previous MD & simulations… Previous MD w/ 25 ns, different intensity, cycle, etc. Simulated T & τ FAIRLY REPRODUCIBLE! SPSU-BD Meeting

  5. 140 MHz, 380 MHz cavities Gain: TOP = 95.4 % (1+2 cav’s) TMAX = 96.3 % (1+3 cav’s) N.B. we used larger εlongthanoperational, also formeasuring TOP  not a perfectreference SPSU-BD Meeting

  6. 240 MHz, 280 MHz cavities Gain: TOP ≈ 94.8 % (1+2 cav’s) TMAX = 97.7 % (1+3 cav’s) As predicted by sim’s… N.B. we used larger εlongthan operational, but not for TOP SPSU-BD Meeting

  7. Loss balance • Simulated: • LOP = 4.4 % • LMIN,1+2cav = 3.5 % • LMIN,1+3cav= 2.1 % • LMIN,2+2cav = 1.9 % • LMIN,2+3cav = 1.3 % • Measured: • 1+2 cav.: 3.8  2.9 % • 1+3 cav.: 4.6(?)  3.7 % • 2+2 cav.: 5.2  2.3 % • Optima in the predicted places • Optimum ‘corridor’ slope as expected, too SPSU-BD Meeting

  8. Conclusions • We have now a set of systematic, reproducible measurements for different voltage options • The ‘2+2 cavity’ case shows significant improvement • The ‘1+3 cavity’ case should be repeated for completeness • An additional measurement of the optimal timings with different voltages and one single reference point is also necessary to correctly estimate the gain in the different cases • We used larger εlong than usual for the measurements with spare cavities • For 1+2 cavities, once we also tried the optimal timing when additional blow-up was applied in the PS; the transmission got slightly worse • Need further studies on the emittance margin • Only 3 weeks left to complete our studies, to verify the above! SPSU-BD Meeting

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